Wetting of rare-earth element oxides by metallic melts

Naidich, Ju. V.; Zhuravljov, V. S.; Frumina, N. I.

doi:10.1007/bf01045739

Cited by 44 publications

(14 citation statements)

References 2 publications

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“…However, if not, their effect as particulate in the molten alloy on the crystal nucleation behaviour needs to be considered. Naidich et al [22] showed that the wetting angles Nishiyama and Inoue [21] reported that the crystallisation of the Pd 40 Cu 30 Ni 10 P 20 alloy is dominated by a heterogeneous nucleation mechanism and the wetting angle of these nucleants (Figure 8b). The foreign substrate that induced nucleation of crystalline embryos in the undercooled melt were predicted to have a critical wetting angle, θ, ∼63° for this particular system.…”

Section: Discussionmentioning

confidence: 99%

High glass formability for Cu–Hf–Ti alloys with small additions of Y and Si

Figueroa¹,

Davies²,

Todd³

2009

Philosophical Magazine

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The effects of small substitutions of Si and Y on the glass forming ability of a Cu 55 Hf 25 Ti 20 glassy alloy are reported and discussed. Fully glassy rods with diameters up to 7 mm and 6.5 mm, were produced for Cu 54.5 Hf 25 Ti 20 Si 0.5 and Cu 55-x Hf 25 Ti 20 Y 0.3 alloys, respectively. The addition of Si enlarged ∆T x (=T x-T g , where T g and T x are crystallisation and glass transition temperatures, respectively) considerably from 25 to 53 K for the Cu 54 Hf 25 Ti 20 Si 1 alloy. However, the results showed that the parameters obtained from thermal analysis, such as T rg , ∆T x and γ[=T x /(T g +T l)] are not reliably correlated with the glass forming ability (GFA), at least for these bulk glass forming alloys. The scavenging effects of the Y and Si, in particular the possibility of Y reducing the oxides, could be responsible for enhancing the GFA. It is proposed that the effectiveness of small additions of Si in enhancing the GFA may be the result of the possible formation of HfSiO 4 having a very large negative enthalpy of formation and, as a strong network former, it would form glassy particles which would be ineffective as nucleating agents.

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Section: Discussionmentioning

confidence: 99%

High glass formability for Cu–Hf–Ti alloys with small additions of Y and Si

Figueroa¹,

Davies²,

Todd³

2009

Philosophical Magazine

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“…Data for Cu-Ti are from Refs. [7,[14][15][16][17][18]; for eutectic Ag-Cu from [11,19]; and for Sn, from [16,20]. Figure 2.…”

Section: Discussionmentioning

confidence: 99%

Reactive spreading: adsorption, ridging and compound formation

2000

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Reactive spreading, in which a chemically active element is added to promote wetting of noble metals on nonmetallic materials, is evaluated. Theories for the energetics and kinetics of the necessary steps involved in spreading are outlined and compared to the steps in compound formation that typically accompany reactive wetting. These include: fluid flow, active metal adsorption, including nonequilibrium effects, and triple line ridging. All of these can be faster than compound nucleation under certain conditions. Analysis and assessment of recently reported experiments on metal/ceramic systems lead to a focus on those conditions under which spreading proceeds ahead of the actual formation of a new phase at the interface. This scenario may be more typical than believed, and perhaps the most effective situation leading to enhanced spreading. A rationale for the pervasive variability and hysteresis observed during high temperature wetting also emerges.

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“…The studies in this field are intended to identify and understand the general rules that govern the interfacial bonding and interactions, more than to obtain a precise value to quantify the interface interactions [56,[64][65][66][67][68][69][70]. The energetics of liquid-metal/solid-zirconia interfaces are usually described by the contact angle θ of a liquid (L) drop of metal on the zirconia solid (S) surface.…”

Section: Interaction Of Liquid Metals With Zirconia Surfaces: Wettingmentioning

confidence: 99%